/Engine/Plugins/Runtime/CommonUI/Source/CommonUI/Public/CommonButtonBase.h
Change whether this widget is locked. If locked, the button can be focusable and responsive to mouse input but will not broadcast OnClicked events.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Common Button|Setters") void SetIsLocked ( bool bInIsLocked )